Details

Autor(en) / Beteiligte

• Yang, Yu
• Zhu, Zhen-yu
• Hu, Ting-ting
• Zhang, Meng-jun
• Qiu, Guan-zhou

Titel

Variation in energy metabolism structure of microbial community during bioleaching chalcopyrites with different iron-sulfur ratios

Ist Teil von

• Journal of Central South University, 2021-07, Vol.28 (7), p.2022-2036

Ort / Verlag

Changsha: Central South University

Erscheinungsjahr

2021

Quelle

SpringerLink

Beschreibungen/Notizen

• The energy metabolism structure of microbial community plays an important role in the process of biohydrometallurgy. In this article, an artificial microbial community composed of three strains ( Acidithiobacillus ferrooxidans, Leptospirillum ferriphilum and Acidithiobacillus thiooxidans ) was used to leach three kinds of chalcopyrites with different iron-sulfur ratios. After 36 d of leaching, the chalcopyrite with iron-sulfur ratio of about 1:1 achieved the highest copper extraction (69.62%). In the early stage, iron oxidizing bacteria predominated, and the expression of rus and rio was 8 times higher than that in the late stage. In the late stage, sulfur oxidizing bacteria predominated, and the expression of tetH and HdrAB was 4 times higher than that in the early stage. Furthermore, the three bioleaching systems above were added with elemental sulfur (3 g/L); the chalcopyrite with iron-sulfur ratio of about 2:1 achieved the highest copper extraction (80.63%). The results suggest that the energy metabolism structure of the microbial community could be changed by changing the iron-sulfur ratio during the leaching process for improving the leaching efficiency of chalcopyrite.